NEW YORK — For the second time in two weeks, the Trump administration has taken the extraordinary step of imposing tariffs on imported products and services from China.

As of Thursday, the administration had imposed tariffs of more than $50,000 per unit on four categories of products and two of its major services: the zera music and entertainment company and the company that makes zeta air purifiers, which are used in air conditioners.

Zeta air-purifier makers say the tariffs would be detrimental to their business.

But the Trump Administration has been adamant that it would not impose such tariffs on zera products.

On Wednesday, the Commerce Department released a report that showed that on average, tariffs levied against zera-product exports had declined from an average of about $100 per unit to $55 per unit between January and May of this year.

The trade dispute has been at the center of an international legal battle over the import of zera goods.

While Trump has made it clear that he intends to pursue tariffs against China, he has also said that he would negotiate with Beijing to reduce or eliminate the tariffs on the country.

Zera, which means “one who lives by zeta” in Sanskrit, is an ancient Indian medicine that has been used to treat respiratory problems, especially those caused by asthma.

In the 1930s, the zeta-air-purifying air-conditioning was developed by a company in the northern Chinese city of Jinan.

In the 1990s, Chinese companies developed a similar product in India, known as the Zeta-Air, which was marketed by Zera in the United States.

Zeda is a member of the zodiac family of plants.

It was named after the zenith of its constellation, which is the constellation of the Zodiac.